Floor Load Deflection Calculation

Loads can be in the form of a single point load linear pressure or moment load.

Floor load deflection calculation. Typically for better performing floors minimal defection is desired. Downward loads tend to deflect the beam downwards. The deflection of floor and roof assemblies shall not be greater than l 360 for plastered construction. So these are the limits set by the code.

Distributed loads are specified in units of force per unit length kn m or plf along the beam and can be applied between any two points. As a result the live load dead load and distribution of forces are different. The dead load on a floor is determined by the materials used in the floor s construction. Chapter 3 of the international residential code irc provides the maximum allowable deflection for a given structural member floor roof wall etc.

This calculator is designed to work with dimensional lumber only. And l 180 for unplastered roof construction. To generate the worst case deflection scenario we consider the applied load as a point load f at the end of the beam and the resulting deflection can be calculated as. Therefore the start and end magnitudes specified by the user must be the same.

The amount of flex depends on the magnitude of the load applied span of the member and stiffness of the member. However if the attic is intended for storage the attic live load or some portion should also be considered for the design of. Uniform loads have a constant magnitude along the length of application. Q force per unit length n m lbf in l unsupported length m in e modulus of elasticity n m 2 lbf in 2.

If you have engineered truss or i beam type joists please do not use this calculator. Whether there will be one fixed end two fixed ends or the load will be supported on both ends. The code section on working load deflection states. The formulas in this calculator only focus on either the downward or upward.

Loads should be determined in accordance with this chapter. This deflection is calculated as. Two different types can be applied in the calculator. I planar moment of inertia m 4 in 4.

2attic loads may be included in the floor live load but a 10 psf attic load is typically used only to size ceiling joists adequately for access purposes. Loads on the other hand affect the beam s deflection in two ways. It is important to list live load dead load and total load separately because live load is used to compute stiffness and total load is used to calculate strength. The direction of the deflection and the magnitude of the deflection.

L 240 for unplastered floor construction. This house is identical to our first example except it is stick built. You also have options depending on the expected configuration of your solution. Enter your floor joist information and then hit calculate deflection to find out your floor rating.